amend error in cursor.sml's 'getCursorColumn' function, where we may need to check tail of string to start convert cursorIdx to relative strIdx
This commit is contained in:
@@ -213,6 +213,44 @@ struct
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end
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| (_, _) => distanceFromLine
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fun helpGetCursorColumnBranch (strIdx, strHd, lnHd, leftStrings, leftLines) =
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if String.sub (strHd, strIdx) = #"\n" then
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(* If we are at newline, column is 0 *)
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0
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else if Vector.length lnHd = 1 then
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(* check if the one line idx in the vector
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* is before the strIdx *)
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let
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val lineIdx = Vector.sub (lnHd, 0)
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in
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if lineIdx < strIdx then strIdx - lineIdx
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else helpGetCursorColumn (strIdx, leftStrings, leftLines)
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end
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else if Vector.length lnHd > 1 then
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let
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(* check if strIdx is inside line vector,
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* and perform binary search if so *)
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val low = Vector.sub (lnHd, 0)
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in
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if low < strIdx then
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(* strIdx is less than low, so use bin search
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* to find lineIdx that is lower than strIdx *)
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let
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val lineIdx = binSearch (strIdx - 1, lnHd)
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(* linebreakPos = index of linebreak before strIdx *)
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val linebreakPos = Vector.sub (lnHd, lineIdx)
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in
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strIdx - linebreakPos - 1
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end
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else
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(* line before strIdx must be in leftStrings/lines *)
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helpGetCursorColumn (strIdx, leftStrings, leftLines)
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end
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else
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(* lnHd has length of 0, so most recent
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* line break must be in leftStrings/lines *)
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helpGetCursorColumn (strIdx, leftStrings, leftLines)
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(* Prerequisite: lineGap is moved to cursorIdx *)
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fun getCursorColumn (lineGap: LineGap.t, cursorIdx) =
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let
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@@ -221,47 +259,35 @@ struct
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lineGap
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in
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case (rightStrings, rightLines) of
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(strHd :: _, lnHd :: _) =>
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(strHd :: strTl, lnHd :: lnTl) =>
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let
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(* convert absolute cursorIdx to idx relative to hd string *)
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val strIdx = cursorIdx - bufferIdx
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in
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if String.sub (strHd, strIdx) = #"\n" then
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(* If we are at newline, column is 0 *)
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0
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else if Vector.length lnHd = 1 then
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(* check if the one line idx in the vector
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* is before the strIdx *)
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let
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val lineIdx = Vector.sub (lnHd, 0)
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in
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if lineIdx < strIdx then strIdx - lineIdx
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else helpGetCursorColumn (strIdx, leftStrings, leftLines)
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end
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else if Vector.length lnHd > 1 then
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let
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(* check if strIdx is inside line vector,
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* and perform binary search if so *)
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val low = Vector.sub (lnHd, 0)
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in
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if low < strIdx then
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(* strIdx is less than low, so use bin search
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* to find lineIdx that is lower than strIdx *)
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let
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val lineIdx = binSearch (strIdx - 1, lnHd)
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(* linebreakPos = index of linebreak before strIdx *)
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val linebreakPos = Vector.sub (lnHd, lineIdx)
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in
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strIdx - linebreakPos - 1
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end
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else
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(* line before strIdx must be in leftStrings/lines *)
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helpGetCursorColumn (strIdx, leftStrings, leftLines)
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end
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if strIdx < String.size strHd then
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(* strIdx is in this string *)
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helpGetCursorColumnBranch
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(strIdx, strHd, lnHd, leftStrings, leftLines)
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else
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(* lnHd has length of 0, so most recent
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* line break must be in leftStrings/lines *)
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helpGetCursorColumn (strIdx, leftStrings, leftLines)
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(* strIdx must be in the strTl *)
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(case (strTl, lnTl) of
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(nestStrHd :: nestStrTl, nestLnHd :: nestLnTl) =>
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let
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val strIdx = strIdx - String.size strHd
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val leftStrings = strHd :: leftStrings
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val leftLines = lnHd :: leftLines
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in
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helpGetCursorColumnBranch
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(strIdx, nestStrHd, nestLnHd, leftStrings, leftLines)
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end
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| (_, _) =>
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helpGetCursorColumnBranch
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( String.size strHd - 1
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, strHd
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, lnHd
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, leftStrings
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, leftLines
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))
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end
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| (_, _) => helpGetCursorColumn (0, leftStrings, leftLines)
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end
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537
temp.txt
537
temp.txt
@@ -1,7 +1,540 @@
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signature TEXT_BUILDER =
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sig
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(* Prerequisite: LineGap is moved to requested line first. *)
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val build: int * int * LineGap.t * int * int
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-> MailboxType.t list
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enda
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end
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structure TextBuilder :> TEXT_BUILDER =
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struct
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val xSpace = 13
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val xSpace3 = xSpace * 3
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val ySpace = 25
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val fontSize = 30.0
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fun accToDrawMsg (textAcc, cursorAcc) =
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let
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open MailboxType
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open DrawMsg
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val textAcc = Vector.concat textAcc
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val cursorAcc = Vector.concat cursorAcc
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val textMsg = REDRAW_TEXT textAcc
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val cursorMsg = REDRAW_CURSOR cursorAcc
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in
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[DRAW textMsg, DRAW cursorMsg]
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end
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fun buildCursor (posX, posY, fWindowWidth, fWindowHeight, r, g, b) =
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let
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val left = posX + 9
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val left = Real32.fromInt left
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val right = left + 12.0
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val top = Real32.fromInt posY
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val bottom = top + fontSize + 2.0
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val halfHeight = fWindowHeight / 2.0
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val top = (~(top - halfHeight)) / halfHeight
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val bottom = (~(bottom - halfHeight)) / halfHeight
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val halfWidth = fWindowWidth / 2.0
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val left = (left - halfWidth) / halfWidth
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val right = (right - halfWidth) / halfWidth
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val vec =
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#[ left, top, r, g, b
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, right, top, r, g, b
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, left, bottom, r, g, b
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, left, bottom, r, g, b
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, right, bottom, r, g, b
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, right, top, r, g, b
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]
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in
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[vec]
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end
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(* builds text from a string with char-wrap.
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* char-wrap is a similar concept to word-wrap,
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* but it breaks on character in the middle of a word.
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*
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* Will likely want multiple versions of these two mutually recursive
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* functions for each selection and cursor type:
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* cursor over an individual character,
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* range selection where multiple characters are selected, etc.
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*
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* Todo:
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* - Possibly add visual horizontal indentation when char-wrap occurs
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* on an indented line *)
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fun buildTextStringAfterCursor
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( pos, str, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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) =
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if pos < String.size str then
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case String.sub (str, pos) of
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#" " =>
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(* if space, then proceed forward one char
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* without adding to acc *)
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buildTextStringAfterCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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| #"\t" =>
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(* if tab, proceed forward one char,
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* and jump visually forwards three chars *)
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buildTextStringAfterCursor
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( pos + 1, str, acc, posX + xSpace3, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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| #"\n" =>
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(* if \n, move down vertically, and move to start horizontally
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* assuming we have not exceeded the window's height.
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* If we have exceeded the window's height, just return acc. *)
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if posY + ySpace < windowHeight then
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buildTextStringAfterCursor
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( pos + 1, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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else
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(* return if there is no more vertical space after line break *)
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accToDrawMsg (acc, cursorAcc)
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| #"\r" =>
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(* same as \n, except we also check if we are in a \r\n pair,
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* and proceed two characters forward if so *)
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if posY + ySpace < windowHeight then
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if
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pos < String.size str - 1
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andalso String.sub (str, pos + 1) = #"\n"
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then
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buildTextStringAfterCursor
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( pos + 2, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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else
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buildTextStringAfterCursor
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( pos + 1, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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else
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(* return if there is no more vertical space after line break *)
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accToDrawMsg (acc, cursorAcc)
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| chr =>
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(* for any other character, add it to acc if there is space,
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* and proceed forward one character in the string *)
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let
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val chrFun = Vector.sub (CozetteAscii.asciiTable, Char.ord chr)
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in
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if posX + xSpace < windowWidth then
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(* if there is horizontal space, place char on the right *)
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let
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val chrVec = chrFun
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(posX, posY, fontSize, fontSize, fWindowWidth, fWindowHeight, r, g, b)
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val acc = chrVec :: acc
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in
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buildTextStringAfterCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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end
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else if posY + ySpace < windowHeight then
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(* if there is vertical space, place char down below at startX *)
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let
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val chrVec = chrFun
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( startX, posY + ySpace, fontSize, fontSize
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, fWindowWidth, fWindowHeight
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, r, g, b
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)
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val acc = chrVec :: acc
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in
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buildTextStringAfterCursor
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( pos + 1, str, acc, startX + xSpace, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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end
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else
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(* return if no space horizontally or vertically *)
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accToDrawMsg (acc, cursorAcc)
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end
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else
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(* if we reached the end of the string,
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* call function to build next string *)
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continueBuildTextLineGapAfterCursor
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( tl, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, cursorAcc
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)
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and continueBuildTextLineGapAfterCursor
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( strList, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, cursorAcc
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) =
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case strList of
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hd :: tl =>
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buildTextStringAfterCursor
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( 0, hd, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, cursorAcc
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)
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| [] => accToDrawMsg (acc, cursorAcc)
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(* same as buildTextStringAfterCursor, except this keeps track of absolute
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* index and cursor pos too *)
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fun buildTextStringBeforeCursor
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( pos, str, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx, cursorPos, hr, hg, hb
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) =
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if pos < String.size str then
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case String.sub (str, pos) of
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#" " =>
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buildTextStringBeforeCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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| #"\t" =>
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buildTextStringBeforeCursor
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( pos + 1, str, acc, posX + xSpace3, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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| #"\n" =>
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if posY + ySpace < windowHeight then
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buildTextStringBeforeCursor
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( pos + 1, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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else
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accToDrawMsg (acc, [])
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| #"\r" =>
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if posY + ySpace < windowHeight then
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if
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pos < String.size str - 1
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andalso String.sub (str, pos + 1) = #"\n"
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then
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buildTextStringBeforeCursor
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( pos + 2, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 2, cursorPos, hr, hg, hb
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)
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else
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buildTextStringBeforeCursor
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( pos + 1, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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else
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accToDrawMsg (acc, [])
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| chr =>
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let
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val chrFun = Vector.sub (CozetteAscii.asciiTable, Char.ord chr)
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in
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if posX + xSpace < windowWidth then
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let
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val chrVec = chrFun
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(posX, posY, fontSize, fontSize, fWindowWidth, fWindowHeight, r, g, b)
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val acc = chrVec :: acc
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in
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buildTextStringBeforeCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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end
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else if posY + ySpace < windowHeight then
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let
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val chrVec = chrFun
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( startX, posY + ySpace, fontSize, fontSize
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, fWindowWidth, fWindowHeight
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, r, g, b
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)
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val acc = chrVec :: acc
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in
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buildTextStringBeforeCursor
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( pos + 1, str, acc, startX + xSpace, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, hr, hg, hb
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)
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end
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else
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accToDrawMsg (acc, [])
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end
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else
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continueBuildTextLineGapBeforeCursor
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( tl, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, absIdx, cursorPos, hr, hg, hb
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)
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and buildTextStringWithinCursor
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( pos, str, acc, posX, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx, cursorPos, cursorAcc, hr, hg, hb
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) =
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if pos < String.size str then
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case String.sub (str, pos) of
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#" " =>
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(* if inside cursor, then create cursorAcc;
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* else, just skip as usual *)
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if absIdx <> cursorPos then
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(* not in cursur *)
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buildTextStringWithinCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
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)
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else
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(* in cursor *)
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let
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val cursorAcc = buildCursor (posX, posY, fWindowWidth, fWindowHeight, r, g ,b)
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in
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buildTextStringAfterCursor
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( pos + 1, str, acc, posX + xSpace, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
|
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, r, g, b, tl, cursorAcc
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)
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end
|
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| #"\t" =>
|
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(* todo: draw cursor if cursor is on tab
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* but this is not a priority right now *)
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buildTextStringWithinCursor
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( pos + 1, str, acc, posX + xSpace3, posY, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
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)
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| #"\n" =>
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if posY + ySpace < windowHeight then
|
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if absIdx <> cursorPos then
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(* not in cursor position, so iterate like normal *)
|
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buildTextStringWithinCursor
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( pos + 1, str, acc, startX, posY + ySpace, startX
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, windowWidth, windowHeight, fWindowWidth, fWindowHeight
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, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
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)
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else
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(* in cursor position, so build cursorAcc
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* and call AfterCursor function *)
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if pos = String.size str - 1 andalso tl = [] then
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(* if we are at end of lineGap, we want to build cursorAcc
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* at different coordinates than usual *)
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let
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val cursorAcc =
|
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buildCursor (startX, posY + ySpace, fWindowWidth, fWindowHeight, r, g, b)
|
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in
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accToDrawMsg (acc, cursorAcc)
|
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end
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else
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let
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val cursorAcc = buildCursor (posX, posY, fWindowWidth, fWindowHeight, r, g ,b)
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in
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buildTextStringAfterCursor
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( pos + 1, str, acc, startX, posY + ySpace, startX
|
||||
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
|
||||
, r, g, b, tl, cursorAcc
|
||||
)
|
||||
end
|
||||
else
|
||||
accToDrawMsg (acc, cursorAcc)
|
||||
| #"\r" =>
|
||||
if posY + ySpace < windowHeight then
|
||||
if
|
||||
pos < String.size str - 1
|
||||
andalso String.sub (str, pos + 1) = #"\n"
|
||||
then
|
||||
buildTextStringWithinCursor
|
||||
( pos + 2, str, acc, startX, posY + ySpace, startX
|
||||
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
|
||||
, r, g, b, tl, absIdx + 2, cursorPos, cursorAcc, hr, hg, hb
|
||||
)
|
||||
else
|
||||
buildTextStringWithinCursor
|
||||
( pos + 1, str, acc, startX, posY + ySpace, startX
|
||||
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
|
||||
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
|
||||
)
|
||||
else
|
||||
accToDrawMsg (acc, cursorAcc)
|
||||
| chr =>
|
||||
let
|
||||
val chrFun = Vector.sub (CozetteAscii.asciiTable, Char.ord chr)
|
||||
in
|
||||
if absIdx <> cursorPos then
|
||||
(* not equal to cursor *)
|
||||
if posX + xSpace < windowWidth then
|
||||
let
|
||||
val chrVec = chrFun
|
||||
(posX, posY, fontSize, fontSize, fWindowWidth, fWindowHeight, r, g, b)
|
||||
val acc = chrVec :: acc
|
||||
in
|
||||
buildTextStringWithinCursor
|
||||
( pos + 1, str, acc, posX + xSpace, posY, startX
|
||||
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
|
||||
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
|
||||
)
|
||||
end
|
||||
else if posY + ySpace < windowHeight then
|
||||
let
|
||||
val chrVec = chrFun
|
||||
( startX, posY + ySpace, fontSize, fontSize
|
||||
, fWindowWidth, fWindowHeight
|
||||
, r, g, b
|
||||
)
|
||||
val acc = chrVec :: acc
|
||||
in
|
||||
buildTextStringWithinCursor
|
||||
( pos + 1, str, acc, startX + xSpace, posY + ySpace, startX
|
||||
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
|
||||
, r, g, b, tl, absIdx + 1, cursorPos, cursorAcc, hr, hg, hb
|
||||
)
|
||||
end
|
||||
else
|
||||
accToDrawMsg (acc, cursorAcc)
|
||||
else
|
||||
(* equal to cursor *)
|
||||
let
|
||||
val cursorAcc = buildCursor (posX, posY, fWindowWidth, fWindowHeight, r, g ,b)
|
||||
in
|
||||
if posX + xSpace < windowWidth then
|
||||
let
|
||||
val chrVec = chrFun
|
||||
( posX, posY, fontSize, fontSize
|
||||
, fWindowWidth, fWindowHeight
|
||||
, hr, hg, hb
|
||||
)
|
||||
val acc = chrVec :: acc
|
||||
in
|
||||
(* can start building after cursor now,
|
||||
* since cursor was built *)
|
||||
buildTextStringAfterCursor
|
||||
( pos + 1, str, acc, posX + xSpace, posY, startX
|
||||
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
|
||||
, r, g, b, tl, cursorAcc
|
||||
)
|
||||
end
|
||||
else if posY + ySpace < windowHeight then
|
||||
let
|
||||
val chrVec = chrFun
|
||||
( startX, posY + ySpace, fontSize, fontSize
|
||||
, fWindowWidth, fWindowHeight
|
||||
, hr, hg, hb
|
||||
)
|
||||
val acc = chrVec :: acc
|
||||
in
|
||||
(* can start building after cursor now,
|
||||
* since cursor was built *)
|
||||
buildTextStringAfterCursor
|
||||
( pos + 1, str, acc, startX + xSpace, posY + ySpace, startX
|
||||
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
|
||||
, r, g, b, tl, cursorAcc
|
||||
)
|
||||
end
|
||||
else
|
||||
accToDrawMsg (acc, cursorAcc)
|
||||
end
|
||||
end
|
||||
|
||||
else
|
||||
(* we have built cursor now, so can call after-cursor function
|
||||
* to build rest of text *)
|
||||
continueBuildTextLineGapAfterCursor
|
||||
( tl, acc, posX, posY, startX
|
||||
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
|
||||
, r, g, b, cursorAcc
|
||||
)
|
||||
|
||||
and continueBuildTextLineGapBeforeCursor
|
||||
( strList, acc, posX, posY, startX
|
||||
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
|
||||
, r, g, b, absIdx, cursorPos, hr, hg, hb
|
||||
) =
|
||||
case strList of
|
||||
hd :: tl =>
|
||||
if cursorPos >= absIdx + cursorPos then
|
||||
(* if end of string is before cursor *)
|
||||
buildTextStringBeforeCursor
|
||||
( 0, hd, acc, posX, posY, startX
|
||||
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
|
||||
, r, g, b, tl, absIdx, cursorPos, hr, hg, hb
|
||||
)
|
||||
else
|
||||
(* if within cursor *)
|
||||
buildTextStringWithinCursor
|
||||
( 0, hd, acc, posX, posY, startX
|
||||
, windowWidth, windowHeight, fWindowWidth, fWindowHeight
|
||||
, r, g, b, tl, absIdx, cursorPos, [], hr, hg, hb
|
||||
)
|
||||
| [] => accToDrawMsg (acc, [])
|
||||
|
||||
fun build
|
||||
(startLine, cursorPos, lineGap: LineGap.t, windowWidth, windowHeight) =
|
||||
let
|
||||
val lineGap = LineGap.goToLine (startLine, lineGap)
|
||||
val {rightStrings, rightLines, line = curLine, idx = curIdx, ...} = lineGap
|
||||
in
|
||||
case (rightStrings, rightLines) of
|
||||
(rStrHd :: rStrTl, rLnHd :: _) =>
|
||||
let
|
||||
(* get index of line to start building from *)
|
||||
val startIdx =
|
||||
if startLine > curLine then
|
||||
let
|
||||
val lnPos = startLine - curLine - 1
|
||||
val startIdx = Vector.sub (rLnHd, lnPos)
|
||||
in
|
||||
if
|
||||
String.sub (rStrHd, startIdx) = #"\r"
|
||||
andalso startIdx < String.size rStrHd - 1
|
||||
andalso String.sub (rStrHd, startIdx + 1) = #"\n"
|
||||
then
|
||||
(* handle \r\n pair *)
|
||||
startIdx + 2
|
||||
else startIdx + 1
|
||||
end
|
||||
else
|
||||
0
|
||||
|
||||
val absIdx = curIdx + startIdx
|
||||
|
||||
in
|
||||
if cursorPos < curIdx + String.size rStrHd then
|
||||
(* if cursor is within string *)
|
||||
buildTextStringWithinCursor
|
||||
( startIdx, rStrHd, []
|
||||
, 5, 5, 5
|
||||
, windowWidth, windowHeight
|
||||
, Real32.fromInt windowWidth, Real32.fromInt windowHeight
|
||||
, 0.67, 0.51, 0.83
|
||||
, rStrTl, absIdx, cursorPos, []
|
||||
, 0.211, 0.219, 0.25
|
||||
)
|
||||
else
|
||||
(* if cursor is after string *)
|
||||
buildTextStringBeforeCursor
|
||||
( startIdx, rStrHd, []
|
||||
, 5, 5, 5
|
||||
, windowWidth, windowHeight
|
||||
, Real32.fromInt windowWidth, Real32.fromInt windowHeight
|
||||
, 0.67, 0.51, 0.83
|
||||
, rStrTl, absIdx, cursorPos
|
||||
, 0.211, 0.219, 0.25
|
||||
)
|
||||
end
|
||||
| (_, _) =>
|
||||
(* requested line goes beyond the buffer,
|
||||
* so just return empty list as there is nothig
|
||||
* else we can do. *)
|
||||
[]
|
||||
end
|
||||
end
|
||||
|
||||
Reference in New Issue
Block a user